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Quarterly Results of Operations (Unaudited) - Quarterly Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 24,700us-gaap_SalesRevenueNet	$ 26,500us-gaap_SalesRevenueNet	$ 26,800us-gaap_SalesRevenueNet	$ 25,800us-gaap_SalesRevenueNet	$ 22,300us-gaap_SalesRevenueNet	$ 24,200us-gaap_SalesRevenueNet	$ 24,000us-gaap_SalesRevenueNet	$ 21,500us-gaap_SalesRevenueNet	$ 103,846us-gaap_SalesRevenueNet	$ 92,045us-gaap_SalesRevenueNet	$ 83,196us-gaap_SalesRevenueNet
Gross profit	7,800us-gaap_GrossProfit	8,100us-gaap_GrossProfit	8,600us-gaap_GrossProfit	7,700us-gaap_GrossProfit	6,500us-gaap_GrossProfit	7,500us-gaap_GrossProfit	7,600us-gaap_GrossProfit	6,000us-gaap_GrossProfit	32,248us-gaap_GrossProfit	27,574us-gaap_GrossProfit	24,327us-gaap_GrossProfit
Operating income	3,000us-gaap_OperatingIncomeLoss	3,400us-gaap_OperatingIncomeLoss	3,900us-gaap_OperatingIncomeLoss	3,300us-gaap_OperatingIncomeLoss	2,000us-gaap_OperatingIncomeLoss	3,000us-gaap_OperatingIncomeLoss	2,900us-gaap_OperatingIncomeLoss	1,400us-gaap_OperatingIncomeLoss	13,607us-gaap_OperatingIncomeLoss	9,328us-gaap_OperatingIncomeLoss	5,418us-gaap_OperatingIncomeLoss
Net income	$ 1,700us-gaap_NetIncomeLoss	$ 2,200us-gaap_NetIncomeLoss	$ 2,600us-gaap_NetIncomeLoss	$ 2,100us-gaap_NetIncomeLoss	$ 1,300us-gaap_NetIncomeLoss	$ 2,000us-gaap_NetIncomeLoss	$ 1,800us-gaap_NetIncomeLoss	$ 900us-gaap_NetIncomeLoss	$ 8,661us-gaap_NetIncomeLoss	$ 6,015us-gaap_NetIncomeLoss	$ 34,961us-gaap_NetIncomeLoss
Basic and diluted earnings per share	$ 0.14us-gaap_EarningsPerShareBasicAndDiluted	$ 0.18us-gaap_EarningsPerShareBasicAndDiluted	$ 0.21us-gaap_EarningsPerShareBasicAndDiluted	$ 0.17us-gaap_EarningsPerShareBasicAndDiluted	$ 0.11us-gaap_EarningsPerShareBasicAndDiluted	$ 0.16us-gaap_EarningsPerShareBasicAndDiluted	$ 0.15us-gaap_EarningsPerShareBasicAndDiluted	$ 0.07us-gaap_EarningsPerShareBasicAndDiluted	$ 0.70us-gaap_EarningsPerShareBasicAndDiluted	$ 0.49us-gaap_EarningsPerShareBasicAndDiluted	$ 2.82us-gaap_EarningsPerShareBasicAndDiluted

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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